Mining-machine.



7121;. SESSIONS.

,MINING MACHINE. I I AIPPLIOAIVTION FILED JUNE is, 1510, RENEWED S EPT.'18, 191s. 7 1,112,332. Patented se t. 29,1914.

x avwcmfoz f 1.5% We Mfr-6M Q wane/mes (-3 O 7 -E.. L'. SESSIONS.

MINING MACHINE.

APPLICATION FILED JUNE'IG, 1910. RENEWED SEPT. 18, 1913.

1 1 12 3 '32. 1' Patented Sept. 2 9,1-914v P. L. SESSIONS. MINING MACHINE; I APPLICATION FILED JUNEIlB, 1910. RENEWED SEPT..-18. 1913,.

'1,11":2,332, tPatented Sept.29,1914.

'1 SHEl J-TSSHEET a.

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imme/50% w tcf Z Z 6 H/H/ 43% I I r fil'm m UNITED s A s PATENT ornicn FWK ;L;.SESSIONS, F COLUMBUS, OHIO,-ASSIGNOR .TO JEFFREY MANUFACTUR COLUMBUS, OHIO; A1 .COBPOBATIO N OF OHIO,-

I sp m fi n f Le t rain. I mailman; 29,1914;

1 A '-1 v 4 Qgiginal application filed Hatch 23, 1910, Serial No. 551,068. Divided and 'this application filed June--16,

' To all whom it hai concern: v

' Be it known hatI, Fran; L. SESSIONS, a

"19 10,Sc i'ia1No. 567,201. Renewed September is; 1913. Serial No. 790,563.-

citiz eii of the United States, residing at C0- lumbu's, in the county of Franklin and State '-of Ohi o ,hav e invented certain new and use- Improvements, in Mining-Machines, of

whichjthe followinggis a specification, ref-- ercnce being had therein to the a'ccOn'ipany' his invention relates to impovem ents in nmim'ng machines, particularly to; the class ofmachines which are characterized by the fact that with the cutting apparatus and framework supporting it, one or more fieXi-.

parallel to the face of the coal as it moves under the draft from the cable.

' Iii-the handling of machines of this sort certain (lilhculties have been encountered, and one of these difficulties has to do with the guiding of the machine during the entering or so-called sumping cut. In making 4 the sumping cut the machine is forced end- 'the'coal, so'as to advance the cutting apwise along the lines transverse to the face of paratus under "the coal preparatory to pro- I pellin'g the machine laterally along the face The'endless chain type of cutting apparatus is commonly employed in machines of this character and the reaction of the coal upon the cutters as they pass around the inner end of-the cutter frame, especially during the first part ofthe entering cut, tends to .swing then-inner end of the machine later .--ally. To prevent this suitable guiding dei that the making of the sumping cut and the v gitudiiially arranged horizontally disposedvices must be provided.

The principal object of the present in vention is the provision of a machine of the character referred to having means for holding the'machine to its work during the entering cut that are structurally simple and adapted to be conveniently handled, so

starting ofth'e side cut along the face-can be effected in a' minimumoftime.

th accom iii in drawin s which. In 6 p IX g g saidbas'e plate and spaced therefrom by the show a preferred embodiment of the invention; Figure -1 is'a plan view of a mining machine embodying my improvements; Fig; 2 IS. a section on the line 2-'2 of 'Fig. l.

3 is a side elevation -of the machine' operating mechanism and the other cutter frame respectively. F ig. 6 is a enlarged section on the line 6-6, Fig. 1. Fig. 7 is an enlarged section'on theline 7-7, Fig. 1. Fig. 8- is an outer end elevation of the friction held angling 'or guiding drum. Fig. t) is a 'side'elevation of said drum. Fig 10 s a .ve'rtica-l section on the line 10 10, Fig.

8. Fig. 11 is a plan view'on a: small scale showing the: machine in position near the right rib of a mine room tobegin the entering or sumping cut. Fig. 12 is a similar view of the machine with the s'umping cut partially coinpletedl' Fig. 13 is a similar view showing the machine when the sump-' ing cut hasbeen completed. Fig. 14 is a plan View on a' smallscale showing the machine as it' is propelled across the room along thecoal face to make the under cut.

, For the purposes of illustration-I have shown in the drawing a mining machine of which A' indicates the bed frame as an entirety, B the cutting apparatus extending from the inner end thereof a-ndsupported thereby, CK) the feedingandguiding mechanism for advancing ther cuttingnpparatus.

and machine eitherhangitudinally or laterally, D the motor mechanism and E-the auxiliary parts employed when it is desired-r.

to have the cutting a'ppa'ratusyadvanced into the coal transversely to the face thereof.

The bed frame may be of any suitable construction. I have shown it comprising a 1 shoe ladapted to rest upon the ground, longitudinally arranged angle,bars' or plates- 2, 2 secured to said shoe at either side thereof and a suitableplatform 5 resting upon and secured to said longitudinal side bars.

4, 4 are webs or plates depending from the platform 3 and carrying at their lower ends the laterally turned longitudinally"extending cutting apparatus guides 5, 5.

lThe cut-ting apparatus comprises a Tonh'aselplate 6, two longitudinally arranged horizontally disposed guide plates 7 above longitudinallyfarranged bars 8 so as to form a chain guide or recess 9; the parts just referred to being secured together many suitsuitably" secured tofthejbase plate and hav-= able manner, as by rivets-l0.

11 is a front sprocket wheel mounted upon" a vertical axis '11,,andbetween the inner.

.end of the base plate 6 and a top plate-l2 tudin'al plane of the axis of the chain frame. It issuitably mounted near ei er' end in bearings l4-and 14', one of which -is car-.

ried by a bearing standardjl ifsuitably secured to the platform 3. The standard 14'? extends transversely of'the machine in either direction from the shaft 14 for the purpose to'be hereinafter described.

.15 is a spur. gear rigidly secured to the shaft 14 and meshing with a pinion. 16 secured to the inner end of the armature Shaina m 17- is a bevel pinion loosely mounted on theshaft 14n ear the outer end thereof.

18 indicatesa positive clutch interposed between the said shaft 14 and the bevel pinion 17, the longitudinally stationary ele-j, ment 18 of'said clutch being secured to the said bevel pinion and -the longitudinally movable element l8 being-splined to the shaft.- 18 indicates suitable mechanism for moving the element 18 of-the clutch in-either direction. Y

19 is a vertically disposed shaft suitably mounted in bearings carried by the bed frame of the machine and having-its axis in the'vertical plane containing the axis of the shaft 14; 20 is a bevel gear'secured to'the upper end of thesaidvertical shaft and in mesh'with the bevel pinion 17. j

21 is a sprocket drive wheel rigidly secured to the lower end of the vertical shaft 19.

22 indicates as an entirety an endless cutter chain or carrier extending around the sprocket drive wheel 21 and the sprocket-.11 carried by the cutter frame, it being arranged at either side within the guides 9 of the said cutter frame and -arrying laterally extending cutters 23 of any suitable construction. The cutter. frame is supported from the bed frame by the longitudinally arranged slides or guides 5 depending from the bed frame andjarrangedto fitsnugly between the base plate'and the upper plate of the chain frame. The bed frame and the nism for shifting the movable element 36' chain frame are normally held from longi- .tudinal movement relative to each other by mechanism. indicated as an entirety by 24,

which also serves as an adjusting means for Theadjustingmechanism 24 comprises a longitudinally arranged screw threaded shaft 24 mounted fnear its inner end in a .bearing' in a depending plate-2.5 'which is secured to the inner end of the bed frame platform 3. Nearits'outer end it is fitted intoa threaded nut 26 which is'arranged between uprights or projections 27, 27 carried by the baseplate 6. .The inner end of this shaft is squared as indicated at 24 to re.-

ceive asuitable wrench for turning the shaft in either direction so as to extend the chain frame relative; to thr bed frame or to adjust it in theopposite direction; as desired.

- 28 is a worm gear'rigidly secured to the longitudinallyarranged shaft 14 near the inner end thereof'and' between the bearing standard l4 and the ear wheel 15 secured tothe said shaft. 29 1s a shaft arranged beneath't-he said shaft 14 and transversely of the bed frame; It is suitably mounted in a bearing 29' secured to the'platform of the said frame. 30 is a worm wheel secured to the inside endv of the said transverse shaft 29 and in mesh'with the worm 28 on the shaft 14. I

31 is a w'orm'rigidly secured to the outside end of the shaft 29.

32 is a longitudinally arranged mounted near either end in bearings 32', 32, carried by bearing standards 14 and 32 the latter being arranged parallel to the former andof substantiallv'the same width and secured to the platform of the bed frame. 'The axis of the shaft'82 is in a vertical. longitudinal plane. on' the opposite side of the vertical longitudinal plane oftheaxis of the shaft 14 from armature shaft. 13.

33 is a worm wheel rigidly secured to the outer end of the shaft 32 and in mesh with the worm 31 on the transverse-shaft 29.

' 34 is a spur gear loosely'mounte'd upon the shaft 32 adjacent to the bearing standard 14, and 35 is a gear Wheel of greater diameter than the gear wheel 34 and loosely mounted upon. the said shaft 32 'a djacent to the bearing standard 32".

'- 36 indicates as an entirety clutch mechanism for alternately connecting the gears 34 and 3510 the shaft 32. Of this clutch mechanism 36' indicates a longitudinally movable element splined to theshaft 32 and carrying atone end clutch jaws 36 adapted to engage clutch-jaws 36? secured to the gear shaft moving the frames relative to each other to vary the tension upon the cutter chain.

jus

wheel and atits other end clutch jaws 36 adapted to engage with the clutch jaws.

carried by the gear wheel 34.

.37 indicates asan ent rety suitable mechacontaining clean er theshaftjl'flf from the i s'i tth f 39 '.is a gear wheel .ri'gjfdly secured to the j with the 'gear'wheel'Bi on the shaft 32, and 40 is' a gear wheel of snialler diameter than 'f 's ed' on the shaft 38 andfpreferably' adjacent 2581mm; of whichis a'pui'ley or ring 41, havsaid 'slotsand adapted to force the periphery of the rim into engagement withv the inner ceive and guide the cable 44 as it is wound 4o spindle can be turned so that the pulley- ,q les to the longitudinal lines of themachine.

. \Yhen the machine is being advanced longifully described presently. The pulley may cable 44. Thus when it is desired to unload '60 machine to draw the machine from the suitably :mounted near either end in bearings. 38 38", ,in the bearing"stan dardsi 14. and-.32 respectively. The axis of the shaft is on the opposite side of the yertical plane shaft 38 near one end thereof and in mesh the gear wheel 39 and rigidly secured near the oppositefflendj of the shaft 38 and in mesh withtlie gearw'heel 35 on the shaft '32.

41 is acable winding drum lcosely'mountk to the gearwhe'el- 40'at the inner end there of. ..The'p eriphery otz'the' cable drum may 'be spirally grooved as indicated at 41 to assist inthe spo'oling' of a draft cable upon; 20 the. drum. H'lhe drum is preferably connected to the shaft 38 by means of a friction clutch 41*, one element of which is a ring or casing 41" carried-byithe drum and ex-' tending outwardly therefrom, and the other ing its rimfradially slotted at fill, 4-1, as indicated'. 1"

' 41? are adjustable wedges or expahders arranged'between the sections of the rim at walls of the ring 4 1" in the well known man'- ner. 43 is a; pulley or sheave arranged to reupon .or is paid out from the drum 1a. This pulley 43 is mounted in a swiveling support having' a. spindle mounted in a bracketfbearing' 43. The pulley can be made to lie in either of-several planes. When the machine, is inoperation-and'isbeing bodily advanced along the faceof the coal the pulleyis-substantially at right antudinally to make'the sumping cut the.pulley -is turned into rearward position, as shown in Figs. 11, 12 and 13, as Wlll be more in fact be made to take any angular position. within a range of about 190, as maybedesired, in moving-the machine about under -its own power by means of the draft the machine fromthe truck on which it is transported from room to room. the pulley may be turned inward and the. draftcable madefast at some point in adyance of the truck. In orderto have the pulley 43automaticallyassume the most adi antageouspos sition when-stress is being exerted uponthe.

cable, the pulley-support or carrier is so. "constructed as to hold the pulley ax s n a spindle part. In other words, the pulley carrier is similar to the fork carrier of a caster wheel.

; For the'purpose of guiding the machine planeother than the plane of the axis of-the pelled laterally along the face of the coal,,I employ a supplemental cable 45 and a drum the shaft 48 by, means of screw. bolt 49. In additionjto' the groove or recessed part s6 of the drum upon which the cable is wound,

a cylindrical extension 50 is provided with '46 upon which said cable may. be wound.

which'a fleniblelbrake band 51 cooperates.

Clamping-lugs '52 "and 53 are riveted or otherwises ecuredlto the respective ends of the brake band '51. 'These lugs-Eire perfo rated to receive-a;- clamping bolt or screw 54 and the lug 53 is slotted to receivea-nut This nut, when the parts are in posi tion as shown in Fig. 8, engages the bottom oif'the slot formed in the lug 53- so that it cannot turn. And thus by turning the bolt 54 one way or the other the'bra 'cket. band may be tightened or lO0Se-1'ld:ftf(lSl1d. As

a convenient means forturnin the-"screw bolt '34 ahandle56 pivotall? the-end of said bolt. A-p'artial revolution of the bolt can bemade with the handle and then-by swinging the handle on its pivot the turning movement can be continued. 7

secured to to pass over a cylindrical boss 57 on the bracket 47,' and the brake band is thus prevented from being bodily displaced.

It may at tim'es be desirable to positively lock the drum against rotation independently ofthe brakeband. To this end a locking pin 58 is slidably mounted in the bracket 47, as shown in Figs..s and9, in position to engage n one of aseries of holes or sockets 59 formed in the adjacent face of the drum' 46 or' of its extension 50. The pin 58 is pivotally connected to a hand lever 60 by means of which it can be and out of locking position. 1 p

,The shaft 48 upon which the drum is mounted is preferably formed with suitable ducts 61 through which oil may flow to the bearingsurfaces o'f the drum, and a duct 62 may be formed in the bracket '47 through which ,oil maybe supplied to the duct G1.

readily moved into For the purpose of feeding and guiding the machine during the initial or' limpingv cut I provide the following, devices. '63 is a guide frame which comprises afbottom part or'shoe designed to slide-overthe" floor of thegmine and an upper transverse bridge .part which rests UPOD. the.

and spans the cutter frameiin themanner shown in Fig 4. The transverse frame part 65 carries depending guide bracket 65,

whichexiends between and slidably engages thesidebars .01" plates 6 and 7 of the cutter framed .rclatlve sliding movement between the ide frame'and the cutter frame of the mac me. being thus provided for. The ex tent of this movement-is indicated in Figs. 11 and 12-,wh1ch show the extreme positions of the guide frame in relation to the ma chine. The bridge part 65 is provided'at itsends with upstanding rounded lugs 6:3",65

which are adapted to receive the lower ends of screwjacks, such as" 66 (see Fig. 114).

Such jack or jacks may be set between the guide frame 63 and the roof of the mine so asto clampthe guide frame rigidly on the floor of the mine, or at least hold it against movement transverse of the n'uachine. The preventionof such movement is the main thing required, and it is to'be understood that I do not mean to limit myself to the use of a jack for this purpose.

In order that the winding-cable 44 may be efficiently used in connection with. the guide frame 63 for making the sumping cut,

the main frame of the machine is preferably .provided with guidesheaves or pulleys 67 68 and 69. The cable 44 'may be extended outward fromthe swiveled pulley 43, passed around the pulleys 67' and 68 and thence ex: tended inward over pulley 69 to a suitable anchoring device, such as a jack at 70.

The manner 'in which my improved machine operates will' readily be understood from the above description.

Assuming that-.it is desired to under-cut -,the face of the coal in a room of a mine which is operated on the room and pillar plan, the machine is first put into the position shown in ig. 11 adjacent the r'ght rib and with the cutting apparatus irected toward and approximatelyat right angles to the face of theae oal to be under cut. The guide fram$3 having been moved inward as far as it will go in relation to the cutter frame, is now jacked down, as indicated in .Fig. 11,- the draft cable 44 is passed outwardover the guide pulleys 67 and 68 on the outer corners of the machine and thence inward over the guide pulley 69 on the right side of .the machine to the jack 70. Current now being applied to the motor, it is set n operation and drives the shaft and gearing down to andincluding the clutch element at 18 and also the clutch element at 36.- The operator upon shifting these drive clutch elements into engagement with their com- .panion parts causes the power to be transmitted first to the cutting apparatus and secondly to the winding drum 41. Thereupon the machine as an entirety 1s drawn enrlwise toward and against the coal.- As

the cutters-engage-thecoal the re ection coal face.

tends to swing the-inner-aelid' of the machine to the right-and its outer-end to the left,

but such movement is prevented by'the combined action of the guide fiame- 63 and the ame. The frame63 acts lll 'thlSd guide until the main frame of by the frame 63-is not essential. Accordingly, the jack 66 having been removed the motor 1s again started and the remainder of the sumping cut is completed bringing -the'- machine into the position shown in Fig. 13.- During the latter part of the sumping cut it will be understood, of course, that the guide frame 63 moved bodily withthe machine.

The initial or sumping out having been made in the manner-stated,- the machine is next propelled laterally along the face of the coal to effect the under-cutting in the 1 following manner. The cable H is detached from the jack 70 and stretched along the face of the coal to the left rib where it is made fast to an anchor as, for example, a jack 71. The end of cable '45 is now made fast to the jack 70, which, if necessary, may be reset in a position more nearly opposite the friction drum '46,.- The motor is now started, or if the motor has been running idle the clutch elements 18 and 36 are thrown into operative. position whereupon the cutters begin to move and the winding drum 41 to rotate. The rotation of drum 41 draws upon the cable 44 so that the machine is gradually fed laterally along the face of the coal, the cutters meanwhile effecting the under cut. The position of the machine during this operation is indicated in Fig. 14.

If the machine during this operation were subjected only to'the draft force of the cable 44 and to the re-action of the coal upon the cutters the outer end of the machine would tend to swing around to the left and the cutters ,would not beheld up to their work. This, however, is prevented by the cable 45 which is paid out against the friction of brake band 51 upon the extension 50 of the drum 46. This frictional force; and therefore the tension in cable 45, can be varied at will by simply adjusting the -clamping-bolt 54 of the brake. The operator thus has within his-control a very simple yet eflicient and convenient means for controlling the angular position of the machine in relation to the If the outer end of the machine tends to swing too much to the left it isonly necessary to tighten the brake bandof drum 46 to sufficiently retard the outer end of the machine. On the other hand, when the innor end-ofthe machiijlew tends to feed too rapidlyinircl ation' to the outer end, it i 14.6; Se aslto positively lock, itfagainst rota-I ":tiont The outer end 'of thel-macliine then fliecomes practicallystationary while-the in ner end vand the cutting apparatus are swung forward by the draft of propelling cable iii When the machine has in this manner been swung into the desirediposi- -tion in relation to the coal face thelokingf pin 58 is withdra\vn and the machine is allowed toadvance bodily under the control of the friction brake on drum l6. The provision of the positive lock for drum 46. obviates the necessity of using thebrake to'effect --a substantiallocking of the drunuand this is advantageous as-tlie brake tends to oper- ,ate more-reliably when the range of; the braking pressure or tension is-not too greata 2'5 obvious, furthermorq that theprovh, 810D. of the positive lock s'aves: the braking;

' apparatus-fromgconsiderable \Yearand tear.

' f -4 It will beiobservedmn referring to ig. 13 that whenthe sumpingcut is finished Itne m'a-fl ,gd-c'hine stands at an-angle tojth'erightrib an d. to-thecoal face. Such an angular posit-ionis-not suitable for making the under'cnt along the face, the proper angular; position-- of the machine relative tothe coal face besyingfmore nearly-that shown 1n fig, H.

; Preferably the machine is-angld-from the position-shown in Fig. 13 to-that shown in.

14 at the beginning of the side out by locking -the retarding drum against rota- '10 desired angle the outer drum is unlocked locked by tightening downthe brake, the latter is loosened-t0 permit the drum to turn at'the rate necessary to maintain the desired angleof the machine.

the coal the guide frame-63 remains in posi tion upon the cutter frame and in direct engagement with the inner end ofv-the bed frame. The said guide frame thus serves the additional function of a bufler-for' the inner end of the main. frame, the inner face of the guide frame being given a rounded or oval conformation, as shown' in F1g.' 1, to

adapt it to readily slide along the face of the coal. j

I do not in this application claim the friction controlled winding drum and'its cable,

which are femployed fpr guld-mg and anfiled March23,'191(), of which tlrelprescnt v means for bodily propelling the machine transversely to. the coal faceto initially jadof a frame,"a cutter frame projecting tion, thus causingithe-maehine' to swing about its outer right hand corner as the propelling cable is wo nnd upon the inner;

drum. As soon as the machine reachesthe and allowedto'tu'rn 'underthe control of m'. the inner end 0 the friction brake or, ifthe, drum had been It' will be observed. that during the menu movement of the machine along-the face of,

glin'g'the machine 'while cutting "along the face, as that forms the subject nmtter'ofmy (re-pending -'a'p phcat1'oi1,- Serial Nol 551,068,

up )lication' is a divisionj -.7d

of a "bed frame; a cutter fra'mej p'rojecting series of cutters mounted upon said "eut tert r y frame, means for bodily propellmg' the ma-i Qchine trzin'sverselylto the 'c'oal -fac'e to iniitially advance the cutters under the coal,

a rigid guide slidably mounted on the'cutter frame, said guide being constructedto -en- 3 gage the floor ofthe mine, and 'in'eans' for fining 'said guide in position on t-l'u'gfmine .:fi0'O 2 "312 .,"r i [I 2. I a miningjmachine, 'the"c'ombin'ation =of afbed frame, a cutter framprojec ting fron'rthe mnerend of the bed fra'nie, a series of cutters mounted upon said cutter fra-me,

va'nce the cutters under'the' coal,"a guide mountedpermanently on the cutter frame to slide longitudinally tl'iereof, 'and means for anchoring saidguide;

1 '3. In 'a mining machine, thefcombination I from the inner end oftheb'ed'frame,-'alser1es of cutters mounted uponsa d cutter: frame, means for bodily propelling; themachine longitudinally to'make the initial cut under the coal and laterally to undercut the coal along its face. and a 'gui'de'mounted slidably upon the cutter frame and adapted to beifikedhn position to guide the cutter frame during the" initial 'cutand to abut against the-inner end of the'bed frame and the face of the coal as themachme is propelled laterally.f p

4. In a mining machine, the-combination of a bed frame, a-cutter frame projecting 11' series'of cutters mounted 'upo'n the cutter frame, means for guiding the cutterframe as it is advanced longitudinally, a draft cable extending from -the rear side'- of the bed frame imvard'to ananchor, and-means for chine longitudinally 4,

5. In a mining machine, the combination of a bed frame, a cutter frame projecting from the inner end of said bed frame, a series of cutters mounted upon the cutter frame, a draft cable, a winding drum therefor mounted on the bed frame, a plurality of. guide pulleys for the cable on the bed frame whereby the cable maybe extended from the front side of the machine along the'coalface to propel the machine laterally or may be ex- .ivinding up said cable to advance the-mavtended from the rear side of the machine tovvard the coal face to advance the machine .-longitudinally,:and. means for guiding the 1:0

-i s haematite- 6: In the combination "of-'a frame, ia' 'cutter frame projecting from-the inner endo'f 'thebed frame, a series means for anc oring :1, Iii a" mm1ng machine, the combi'nation from-the inner'end of the bedframe, a series *of cutters mounted upon said cutter frame,

means for "bodily' propelling the machine transversely tojthe' coal'fa e to initially advance' the cutters under t ecoal', as ide frame slidably engaging said cutter ame and having its outer side formed to fit against the inner end of'the bed frame and its front side rounded to slide along the face of the, coal when: the machine .is propelled laterally, and means for anchoring the guide and having itsouter side formed to fit frame.

' -.8. In a mining-'machine,.the combination of a .bed frame,la cutter frameprojectingfrom the'inner'end ofthe bed frame',. a series of cutters mountedv upon said eutterfr'ame,

'means for, bodily propelling the machine transversely to the'coal fade to initially advance the cutters under the' coal, a. guide frame arranged transversely .of the cutter frameand comprising abot'tom plate ada t ed to slide over the mine floor, and a bri ge part on said bottom plate spanning the cutter frame, and having a depending bracket 5 slidably engaging the cutter frame, the outer side ofsaid bridge part bein formed to'fit against the inner end of the. ed frame and.

the. inner side of said ,bridge part being rounded to jslide along the facei fthe coal when the machine is propelled laterally, and

means for anchoring the guide frame."

-9.' -In a mining machine, the combination of a bed' frame, a cutter frame pro ect1ng fromthe innerend 'of -th'e. bed frame, a ser es of cutters mounted uponsaid cutter frame,-

means for bodily propelling the machine transversely to the coal face to initially adthe guideagainst the mine floor.

'vance the cutters-under til atrial, a guide" mounted permanently'on thecutter frame to slide longitudinally thereof, and means for holdmg said guide against movement transverse of the machine. a

1 0. 1'n a Ininin'gmachine, the combination of a. bed frame, a cutter .frame projecting from the inner end of the bed frame, a series of cutters mounted upon said cutter frame,

means for bodily propelling theamachine;

the coal and laterally to undercut the coal along its face, and a guide mounted slidably held against movement transverse of themaehine during the initial cut and to abut against the inner end of the bed frame and -the face of the coal as the machine is propelled laterally.

11. In a mining machine, the combination of a bed frame, a cutter frame projecting from the inner end of the bed frame, a series of cutters mounted upon said cutter frame,

means for bodily propelling the machine.

transversely to the coal face to initially ad- .Yance'the cutters under the coal, a guide frame-slidablyengaging said cutter frame,

against-the inner end ofthe bed frameand its inner side rounded to slide along the face of the coal when the machine is propelled laterally, and-means" for holding the guide .longitudinally'to make the initial out under upon the cutter frame and adapted to be frame against movement-transverse of the machine.

12. In-a mining machine, the combination of a bed frame, acutter frame projecting from the inner end of the bed frame, a series of cutters" mounted upon said cutter frame, means for bodily propelling the machine transversely to the coal face to initially advance the cutters under the coal, a guide. frame comprising a bottom plate adapted to engage the mine floor and an up-stan'ding part on said bottom plate slidabl-y engaging the cutter frame, and' a .jack for clamping In testimony whereof I afii z my signature,- in presence of two w tneses. v

' RANK L.I SES SION S. lVitiiesses': .i

'- EL P.-SNIVELY,

A. M. READ.- 

